Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 35

■ Specifying the start I/O number of intelligent function module
When accessing the buffer memory or I/O signals of the intelligent function module, specify the start I/O number using the
index register.
By receiving the start I/O number as an input variable, the same function block can be shared in multiple intelligent function
modules without changing the start I/O number.
Ex.
To access the I/O signals of the intelligent function module
Use the index register.
[Sequence program]
[FB program]
Ex.
To access the buffer memory of the intelligent function module
 Input the start I/O number of the target intelligent function module in the index register.
 Shift the four bits in the value to the right by using the SFR instruction, or use the quotient obtained by dividing the value by 16.
Specify the value of
i_Start_IO_NO.
Access the I/O signals by using
the index register.
Ò
Ó
Access the buffer memory.
3 PROGRAM ORGANIZATION UNITS
3.4 Precautions
3
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